X509.v3 certificate extension for authorization of device ownership
draft-richardson-6tisch-idevid-cert-01

Abstract

This document details an X.509 extension to provide authorization and indication of ownership of a constrained device containing 802.1AR IDevID.

Status of This Memo

This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79.

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Copyright Notice

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Table of Contents

• 1. Introduction
• 1.1. Terminology
• 2. Autonomous System Identifier Delegation Extension
• 2.1. Context
• 2.2. Specification
• 2.2.1. Criticality
• 2.2.2. Syntax
• 2.2.3. Type IDevID
• 2.2.4. Elements asnum, rdi, and Type ASIdentifierChoice
• 2.2.5. Element inherit
• 2.2.6. Element asIdsOrRanges
• 2.2.7. Type ASIdOrRange
• 2.2.8. Element id
• 2.2.9. Element range
• 2.2.10. Type IDevIDRange
• 2.2.11. Elements min and max
• 2.2.12. Type IDevId
• 2.3. Autonomous System Identifier Delegation Extension Certification
• 3. Security Considerations
• 4. Acknowledgments
• 5. Appendix A -- ASN.1 Module
• 6. Appendix C -- Example of an AS Identifier Delegation Extension
• 7. Normative References
• Author's Address

1. Introduction

This document defines two X.509 v3 certificate extensions that authorize the transfer of the right-to-use for a set of devices identified by 802.1AR IDevID from a production Factory through national and regional distributors (VARs) to Plant Owners/Operators. This extension binds a list of IDevID identifiers to the subject (private key holder) of a certificate. The issuer of the certificate is an entity (e.g., a Factory) that has produced the device to to transfer ownership set of IDevID to the subject of the certificate. These certificates provide a scalable, no-touch means of verifying the ownership of a constrainted device. The constrained is initialized with the trusted certificate of the Factory at the Factory. This process may be used by enrollment protocols such as 1x, PANA, EAP-TLS and RPL to validate that the network infrastructure being presented is the legitimate infrastructure for the constrainted device.

Sections 2 specify several rules about the encoding of the extensions defined in this specification that MUST be followed. These encoding rules serve the following purposes. First, they result in a unique encoding of the extension's value; two instances of an extension can be compared for equality octet-by-octet. Second, they achieve the minimal size encoding of the information. Third, they allow relying parties to use one-pass algorithms when performing certification path validation; in particular, the relying parties do not need to sort the information, or to implement extra code in the subset checking algorithms to handle several boundary cases (adjacent, overlapping, or subsumed ranges).

1.1. Terminology

It is assumed that the reader is familiar with the terms and concepts described in "Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile" [RFC3280], "INTERNET PROTOCOL" [RFC791], "Internet Protocol Version 6 (IPv6) Addressing Architecture" [RFC3513], "INTERNET REGISTRY IP ALLOCATION GUIDELINES" [RFC2050], and related regional Internet registry address management policy documents. Some relevant terms include:

allocate - the transfer of custodianship of a resource to an intermediate organization (see [RFC2050]).

assign - the transfer of custodianship of a resource to an end organization (see [RFC2050]).

Autonomous System (AS) - a set of routers under a single technical administration with a uniform policy, using one or more interior gateway protocols and metrics to determine how to route packets within the autonomous system, and using an exterior gateway protocol to determine how to route packets to other autonomous systems.

Autonomous System number - a 32-bit number that identifies an autonomous system.

delegate - transfer of custodianship (that is, the right-to-use) of an IP address block or AS identifier through issuance of a certificate to an entity.

initial octet - the first octet in the value of a DER encoded BIT STRING [X.690].

IDevID - a variable octet identifier written as in hexadecimal. While there is no length limit to the IDevID, a Factory is expected to pick a particularly length and stick to that length so that the IDevID can be aggregated by simple integer enumeration.

subsequent octets - the second through last octets in the value of a DER encoded BIT STRING [X.690].

trust anchor - a certificate that is to be trusted when performing certification path validation (see [RFC3280]).

The keywords MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD, SHOULD NOT, RECOMMENDED, and MAY, and OPTIONAL, when they appear in this document, are to be interpreted as described in [RFC2119].

2. Autonomous System Identifier Delegation Extension

This extension conveys the delegation of ownership of a device identified by an 802.1AR Device ID to an entity by binding those IDevID to a public key belonging to the entity.

2.1. Context

802.1AR defines a mechanism by which a manufacturer may place a certificate that attests to the a device's identity into the device at manufacturer time. This mechanism permits a device to cryptographically identify itself to a network. The device, however is unable to know to which network it belongs. This extension permits the manufacturer, using the same trusted anchor to delegate ownership of the device to the end user (possibly via a series of intermediaries, such as a supplier chain). The use of such a certificate chain can be easily verified by the device, and therefore, combined with 802.1AR, permits mutual authentication of devices and network entities.

2.2. Specification

    id-pe-iDevID OBJECT IDENTIFIER ::= { id-pe IANA-TBD }
    where [RFC3280] defines:

    id-pkix OBJECT IDENTIFIER ::= { iso(1) identified-organization(3)
        dod(6) internet(1) security(5) mechanisms(5) pkix(7) }

    id-pe OBJECT IDENTIFIER ::= { id-pkix 1 }
          

    id-pe-iDevID OBJECT IDENTIFIER ::= { id-pe IANA_TBD }

    IDevID ::= SEQUENCE { idevnum [0] EXPLICIT
                IDevIDChoice OPTIONAL,
                rdi [1] EXPLICIT ASIdentifierChoice OPTIONAL
            }

    IDevIDChoice ::= CHOICE { inherit NULL, -- inherit from issuer --
                iDevIdsOrRanges SEQUENCE OF iDevIdOrRange
            }

    IDevIdOrRange ::= CHOICE { id IDevId, range IDevRange }
    IDevRange ::= SEQUENCE { min IDevId, max IDevId }
    IDevId ::= INTEGER